<template>
   <div>
    <div class="search">
        <input type="text" v-model="keyword"
            class="search-input" placeholder="请输入城市名或拼音" />
    </div>
    <div class="search-content" ref="search" v-show="keyword">
        <ul>
            <li v-for="item of list" 
                :key="item.id" 
                class="search-item border-bottom"
                @click="handleCityClick(item.name)"
            >
                {{item.name}}
            </li>
            <li class="search-item border-bottom" v-show="hasNoData">
                没有找到匹配数据
            </li>
        </ul>
    </div>
   </div>
</template>
<script>
import Bscroll from 'better-scroll'
import { mapState , mapActions } from 'vuex'
export default {
    name: 'CitySearch',
    props: {
        cities: Object
    },
    data () {
        return {
            keyword: '',
            list: [],
            timer: null
        }
    },
    computed: {
        hasNoData () {
            return !this.list.length
        }
    },
    watch: {
        keyword () {
            if(this.timer){
                clearTimeout(this.timer)
            }
            if(!this.keyword){
                this.list = []
                return
            }
            //函数截流减缓性能
            this.timer = setTimeout(() => {
                //将搜索的关键字存入result数组里
                const result = []
                for (const i in this.cities) {
                    this.cities[i].forEach((value) => {
                        if(value.spell.indexOf(this.keyword) > -1 ||
                            value.name.indexOf(this.keyword) > -1){
                                result.push(value)
                        }
                    });
                }
                this.list = result
            },30)
        }
    },
    mounted (){
        this.scroll = new Bscroll(this.$refs.search);
    },
    methods: {
        handleCityClick (city) {
            // this.$store.dispatch('changeCity',city)
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapActions(['changeCity'])
    }
}
</script>
<style lang="stylus" scoped>
    @import '~styles/varibles.styl'
    .search
        height .72rem
        padding 0 .1rem
        background $bgColor
        .search-input
            box-sizing border-box
            height .62rem
            line-height .62rem
            width 100%
            text-align center
            border-radius .06rem
            color #666
            padding 0 .1rem
    .search-content
        position absolute
        z-index 1
        overflow hidden
        top 1.58rem
        left 0
        right 0
        bottom 0
        background #eee
        .search-item
            line-height .62rem
            padding-left .2rem
            color #666
            background #fff
</style>

